the fbi investigated to see whether the affair would be a security risk. >> reporter: it was just over a year ago, his wife by his side, that one of america's most decorated generals took the oath of office as cia director. today he resigned in disarrays. in a statement -- in disgrace." i showed extremely poor judgment by gentlemen of engaging in an extra marital affair." the affair came to light during an investigation that started months ago. officials became concerned about e-mails he exchanged with his biographer. >> it's sad. >> reporter: cbs 5 military analyst colonel brendan carney met him during his book tour >> she acknowledged she had been given unfetterred access to him. >> does that seem suspicious to you when you think back? >> in 31 years of being around an awful lot of general officers, i've never heard of anybody having the type of access that she had. and was i suspicious? no. i'm not going to give myself credit for that. >> reporter: the white house insists it knew nothing about the investigation until petraeus told the president after the election. his confession com